Journal
APPLIED ENERGY
Volume 102, Issue -, Pages 204-210Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2012.03.066
Keywords
Popping pretreatment; Ethanol productivity; Mandarin peel waste; Limonene
Categories
Funding
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning [2010T100100573]
- Korea government Ministry of Knowledge Economy
- Priority Research Centers Program [2011-0018393]
- WCU (World Class University) through the National Research Foundation of Korea (NRF) [R31-2009-000-20025-0]
- Ministry of Education, Science and Technology
- National Research Foundation of Korea [2010-0020141, R31-2012-000-20025-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, we designed a biomass popping pretreatment, system using a fired burner and a horizontal cylinder rotating on an axis, to produce ethanol from mandarin (Citrus unshiu) peel (MP) waste. Popping pretreatment was performed at 150 degrees C for 10 min without chemical treatment. Popping pretreatment reduced the size of particles to less than 1 mm and decreased the concentration of D-limonene, a yeast fermentation inhibitor, from 0.21% to 0.01%. Enzymatic hydrolysis of pretreated MP was performed in 50 mM sodium acetate buffer (pH 4.8) at 45 degrees C for 6 h, and the total saccharification rate was approximately 95.6%. The vacuum evaporation process increased the fermentable sugar concentration to 10% (glucose 7.1% and fructose 2.9%). Subsequent fermentation at 30 degrees C at pH 5.0 for 12 h in a laboratory bio-reactor increased the ethanol yield to 90.6%, compared to 78% at 36 h from raw MP. (C) 2012 Elsevier Ltd. All rights reserved.
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